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Twin-crystal of chrysoberyl
Dumortierite in rock crystal, Brazil, polarised light
Colour zoning in ruby from Mong-Shu, Burma
Structure in a healing fissure in topaz from Brazil
Inclusions of gilalite aggregates in rock crystal from Brazil
Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia
Dendrites in agate
Stress fissure («sun spangle») in baltic amber

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